来自黄芪属植物的半胱氨酰 - tRNA合成酶。
Cysteinyl-tRNA Synthetase from Astragalus Species.
作者信息
Burnell J N
机构信息
School of Environmental and Life Sciences, Murdoch University, Murdoch, 6153, Western Australia.
出版信息
Plant Physiol. 1979 Jun;63(6):1095-7. doi: 10.1104/pp.63.6.1095.
Abstract
l-Cysteinyl-tRNA synthetases (EC 6.1.1.16) from four Astragalus species were partially purified. The substrate specificities of the cysteinyl-tRNA synthetase from three selenium accumulator species (A. crotalariae, A bisulcatus, and A. racemosus) were compared with those from two nonaccumulator species (A. lentigenosus and Phaseolus aureus). All species had similar K(m) values for cysteine, selenocysteine, and alpha-aminobutyric acid except A. bisulcatus which failed to use selenocysteine as a substrate and which had a K(m) for cysteine four times greater than the K(m) values for other species.
摘要
对四种黄芪属植物的L-半胱氨酰-tRNA合成酶（EC 6.1.1.16）进行了部分纯化。比较了三种富硒植物（猪屎豆黄芪、双槽黄芪和总状黄芪）与两种非富硒植物（斑纹黄芪和绿豆）的半胱氨酰-tRNA合成酶的底物特异性。除双槽黄芪不能利用硒代半胱氨酸作为底物且其半胱氨酸的米氏常数（K(m)）比其他物种的K(m)值大四倍外，所有物种对半胱氨酸、硒代半胱氨酸和α-氨基丁酸的K(m)值相似。
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本文引用的文献
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2
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Selenium derivatives in proteins.
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